Mirador viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/492/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e9f8994b-9cc6-4b62-ad01-dcd75381c5e5",
      "cw-e60121c2-6b01-46b4-b471-035fec2e5d71"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e2ae7b58-7ec1-4fc9-9122-7bf54573e40d",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll230/492/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e60121c2-6b01-46b4-b471-035fec2e5d71"
  }
}